Machine for producing gears



L 1929- A. H. CANDEE ET AL 1,732,632

MACHINE FOR PRODUCING GEARS INVENTORS flllam ii Candee (i MagzzusHJolzazzaoiz 7 W ATTORNEY Oct. 22, 1929..

Filed Dec. 50. 1926 4 Sheets-Shet 2 INVENTORS fillazz H Candee a2 Y flayzzusiiwimzzson ATT NEY 1929. A. H. CANDEE ET AL 1,732,632

MACHINE FOR PRODUCING GEARS Filed Dec. 30, 1926 4 Sheets-Sheet 5 4'. u m-IIIII'IIIIIII;

/62 INVENTORS hmr gg g- 5 5 1 BY \NKW I63 ATTQ NEY Oct. 22, 1929. A. H. CANDEE ET AL 1,732,632

MACHINE FOR PRODUCING GEARS Filed Dec. 50. 1926 4 Sheets-Sheet 4 ENVENTORS mama Candee ATTO Patented on. 22, 1929 UNITED STATES PATENT OFFICE -.ALLAN a. cannnnami menus a. .ronanson, or nocnnsrnn, new Yonx, assrenons TO GLEASON WOBKS, O1 ROCHESTER, NEW YORK, A CORPORATION 018 NEW YORK MACHINE FOR PRODUCING GEARS Application filed December 30, 1828. Serial No. 158,088.

The present invention relates to machines chines in which theblank is given a confirm-- ous indexing motion and in which the cutting is effected by a planing tool reciprocated by a crank.

When a planing tool is reciprocated by means of a crank across the face of a continuously rotating gear blank, a curved slot is cut in the blank which is of double curva ture and of general S-shape. As the tool moves through the cut, the clearance angle between the side of the tool and the tooth varies appreciably and this oftentimes causes chatter or produces a poor tooth surface finish. As pointed out in our copending application, No. 70,864, filed November 23, 1925,

which has matured into Patent No. 1,616,439

of February 8, 1927, these difficulties may be overcome by imparting a further relative movement between tool and blank at a vari{ able velocity and preferably at a multiple of the frequency of the variable velocity of the tool under actuation of the crank.

The present application is a continuation in part of the prior application above mentioned.

Une of the objects of the present invention is to provide a modified form of machine op erating upon the general principles defined in our application above mentioned.

A further object of this invention is to provide a machine operating upon the principles defined in our prior application in which the added variable relative movement between tool and blank is incorporated, through a differential, in one of the primary gear trains of the machine, thereby imparting to the'element actuated'by said train, a variation in velocity but not of direction. 7

A further object of this invention is to provide a machine of the type referred to, in which the added variable motion is incorporated in the blank'drive. I

A further object of this invention is to provide means for mounting gear and pinion blanks upon opposite ends of the blank spindie, and to provide a support for the blank spindle which may be swivelled end for end to bring either end of the blank spindle into operative relation with the tool, so that either gear or pinion blanks may be cut'upon the same machine. 1

A still further object .of this invention is toprovide mechanism for adjusting thedistance which the tool is lifted out of the cut to clear the work on the return or idle' stroke of the tool.

In a machine constructed according to the present invention, preferably, also, a gearing arrangement is provided which permits of employing the same set of ratio change gears cutting the two members of a pair of longitudinally curved tooth gears.

Other objects of the invention will be apparent hereinafter from the specification and from the recital of the appended claims.

In the accompanying drawings, we have illustrated, a preferred embodiment of our invention. It will be understood, however, that the invention is capable of further modification within its scope and within the limits of the appended claims.

In the drawings:

Figure 1 is a side elevation, partly in sectlon, of a machine constructed accordin to the preferred embodiment of this invention;

Figure 2 is a sectional plan view of the tool mechanism and cradle;

Figure 3 is a section on the line 33 of Figure 1;

Figures 4 and 5 are details of the mechanism for clapping the tool;

Figure 6 is a detail of the cradle drive;

Figure 7 is a detail of the gearing of the machine;

Figure 8 is a plan view, with parts broken away, of the tool head, showing the tool in cutting position; and

Figure 9 is a side elevation of the tool head and associated parts.-

The motion imparted to a planing tool by a crank is at a variable velocity and of a simple harmonic nature, the tool moving fastest in the middle of the stroke and slower toward each end. It is this movement of the tool at a variable velocity which combines with the uniform rotary motion of the blank to produce the S-shaped tooth curve. The

improvement of our copending application above referred to consists in the discovery that by imparting another motion at a relatively variable velocitv between the tool and blank, also of a harmonic nature, but preferably of a different frequency from the harmonic motion of the tool under actuation of the crank, a tooth curve will result which will throughout its length bend substantially in one direction. This discovery, permits of cutting gears with a substantially uniform tool clearance and the tooth curves of mating gears can be matched exactly or as closely as desired.

The primary purpose of the present invention is to provlde a modified form of machine for practising the gear cutting process resulting from this basic discovery. In a machine constructed according to the preferred embodiment of the present invention, the added motion at a variable velocity is imparted to the blank and combined with the continuous indexing rotation of the blank. In a machine constructed accordin to this embodiment, the tool is reciprocated by means of a crank or equivalent mechanical element, a continuous rotary movement at a uniform velocity is imparted to the blank spindle for the purpose of continuously indexing the blank, and simultaneously an additional movement at a variable velocity is imparted to the blank spindle, this movement combining with the reciprocatory movement of the tool and the uniform rotary movement of the blank to produce the longitudinal tooth shape. In the preferred embodiment of this invention, the additional motion at a variable velocity is imparted to the blank through a differential which is incorporated in the blank drive. In this way, the uniform and variable velocity movements of the blank spindle are combined by means of the differential so that the blank moves continuously in one direction.

The present invention is illustrated in connection with a machine for enerating bevel gears. It will be understoo however, that this invention is applicable to the production of other types of gears also, Whether generated or non-generated.

In the machine illustrated, the tool T is mounted upon a tool head 10 which is adjustable upon a tool slide 11. The tool slide 11 is reciprocable in guide ways 12 formed in an arm 13 which is pivotally mounted upon a cradle 14 which is journaled in bearings 9 and 9 formed in the frame 15 of the machine. The generating motion of the tool is effected by continuous rotation of the cradle on its axis.

The reciprocating movement of the tool is produced by rotation of the crank 17 which is ournaled in a suitable bearing 18 formed in the cradle 14, the crank being operatively connected with the tool slide 11 by means of the connecting rod 19. This connecting rod 19 is connected at one end with the tool slide 11 by means of the pin 20 and at the other end with the crank plate by means of the slidably ad-' justable block 21. The rotary motion of the crank is derived from the main drive shaft 22 which is mounted coaxially of the cradle and which is driven from the motor 23 b means of the change gears 24 and 25, the she t 26 and the bevel gears 27 and 28. The crank in turn is driven from the main shaft 22 b means of the bevel gears 29 and 30, the stub shaft 31, and the bevel gears 32 and 33, the latter being fixedly secured to the crank disc.

As in other planing machines, the tool 1 cuts during its movement in one direction only, being out of cutting position on the return stroke. The means for clapping or moving the tool to and from cutting position at the end of its stroke will be described more particularly hereinafter.

During the reciprocating movement of the tool, a continuous rotary motion at a uniform velocity is imparted to the blank. This movement combines with the planing movement of the tool to produce the tooth curve during the cutting operation and acts to index the blank during the period the tool is out of cutting position and is being returned for operation upon a new tooth space.

The present machine is particularly adapted for the cutting of bevel gears. In bevel gear pairs, the pinion is usually much smaller than the gear. To hold the blank rigidly during cutting, different mountings are ordinarily required for gear and pinion blanks. This usually means that different machines must be employed in cutting gears and pinions. The machine of the present invention obviates this by providing means for securing a gear blank to one end of the blank spindle and a pinion blank to the other end thereof and by providing a support for the blank spindle which may be swivelled end for end to bring either end of the blank spindle and the blank carried thereby into operative relation with the tool.

The blank spindle 35 is journaled in a support 36 which is swivelly adjustable upon a slide 37 which, in turn, is laterally adjustable upon the guide plate 38. This guide plate 38 is in turn angularly adjustable upon the bed or frame 15. The blank spindle 35 is provided at opposite ends with means for securing a gear blank G, shown in section in Figure 1, or a pinion blank P, shown in dotted lines, thereto. For this purpose, the blank spindle is provided adjacent one end with a head 39 to which is secured a face plate 40. This face plate serves to support a gear blank, when the machine is to be used in cutting large sized gears, the gear blank G being secured to this face plate by means of the spacing disc 41, the clamps 42, and the bolts 43 which are provided with T-heads which engage in corresponding slots 44 formed .in the face plate.

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' The clamping disc 41 is mounted upon a -member 45 which is adapted to be securely port for a pinion blank and if a pinion blank is to be cut, it can be clamped against this seat by means of the rod 46 and the clamping plate 47 or by means of a similar rod of suitable length.

The support 36 has formed integral w th it adjacent the pinion endof'the blank sp1ndie, a bracket 48 which may serve as a support for a steady-rest for the pinion blank, so as to hold the pinion blank very rigidly during cutting.

The support 36 is formed with an annular hearing 50 which seats on an annular pro ection 51 formed on the slide 37. The support 36 swivels about an axis coaxial with the bearing 50, so that, either end of the blank spindle can be brought opposite the tool and either a pinion or gear blank may be out. The swivelling adjustment of the support 36 is accomplished by rotation of the shaft 52, as by means of a wrench. This shaft 52 car ries a spur pinion 53 which meshes with a spur gear 54 which is secured'to the slide 37 and which is mounted coaxially of the bearing 50.

The slide 37 is slidably adjustable upon the plate 38 for the purpose of moving the blank to be out toward and away from the axis of the cradle so as to locate the apex of the blank in the desired relation to the axis of the cradle, the axis of the cradle representing the axis of the basic gear with which the blank is rolled for the purpose of generating the tooth profiles. The lateral adjustment of the slide 37 is effected by the rotation of the shaft 55 and the gear 56 carried thereby which meshes with a rack 57 which is secured to the plate 38. The slide 37 may be secured in any adjusted position by means of bolts 58 which engage in T-slots 59 formed in the plate 38.

The plate 38 is angularly adjustable about an axis which intersects at right anglesthe axis of the cradle, so that the blank can be adjusted into the proper cutting plane. For the purpose of this adjustment the plate 38 is provided with an extension or arm 60 which has a bearing upon the stud 61 secured to the bed of the machine. This adjustment may be eii'ectedby rotation of the pinion 62 which meshes with a segment 63 secured to the bed.

We shall next describe the means for imspindlef The bolts 43 and parting to the blank its continuous rotary indexing movement. Journaled in the sleeve 65 of the differential housing 66 (Figures 1 and 2) and in a bearing 67 provided on the frame 15 is an auxiliary shaft 68. This auxiliary sh'aft68 is driven by means of the differential gears 69, 70 and 71.- The gear 70 is mounted to rotate with the differential housing which is itself journaled in a suitable bracket secured to the frame 15. This gear 70 serves to transmit-the combined rotation of the gear 71 and of the differential housing 66 to the ear 69 and'to the auxiliary shaft 68 to whic the gear 69 is secured. Secured to the sleeve 72 of'the differential housing 66 is a bevel gear 73 which is in mesh with and is driven by a bevel pinion 74 which is keyed to the cradle 14. The differential gear 71 is secured to the shaft 75 which is journaled' in the sleeve 72 and which carries at its other end a bevel gear 76 which meshes with and is driven by the bevel gear 77 which is secured to the main drive shaft 22. The purpose of the differential will be described more partticularly hereinafter.

The auxiliary shaft 68 drives through the miter gears 79 (Fig. 1) a shaft 80 to which is secured one of a set of differential gears 81 through which the motion of the shaft 80 is transmitted to the shaft 82 which carries at its other end one of a set of differential gears 83. The differential gears 83 serve to transmit the motion of the shaft 82 to a shaft 84. The shaft 84 drives the telescoping shaft 85 through the pinion 8.6, the bevel gear 87 and.

the sleeve to which the gear 87 is secured, and the miter gears 88. The telescoping shaft 85 1s mounted in suitable bearings in the slide 37 and carries intermediate its length a miter gear 90 which meshes with a miter 91 secured to the shaft 92 which is journaled in the support 36 coaxially of the swivelling axis of th s support 36. Through this mounting, the m ter 91 always remains in mesh with the miter 9O regardless of which end of the blank spindle 35 is in cutting relation with the tool. In this way the rotation of the shaft85 1s always transmitted to the shaft 92 regard 'less of the adjustment of the support 36. The

shaft 92 carries a miter gear 93 which meshes with a miter 94 on a stub shaft 95 which is suitably journaled in the support 36. The stub .shaft 95 drives the worm shaft 96 through the miter gears 97, and the index change gears 98, 99, 100 and 101, the latter being mounted upon shafts suitably jourdescribed, a conjournaled upon the transverse shaft 116 and' For the purpose of generating the tooth parted to the cradle from the auxiliary shaft 68, this shaft carrying a bevel gear 105 which meshes with a bevel gear 106 upon a shaft 107 which is suitably journaled in the frame. The shaft 107 drives a parallel shaft 108 through the feed change gears 109, 110, 111 and 112 (Figures 1 and 2). The shaft 108 carries a bevel gear 113 which is continuously in mesh with a pair of bevel gears 114 and 115 constituting a usual type of reversing mechanism. The bevel gears 114 and 115 are loosely may be selectively coupled to this-shaft 116 by means of the yoke 117 which has a splined connection with the shaft 116 and which is provided on either end with ratchet teeth adapted to be engaged selectively with ratchet teeth formed upon. the end faces of the gears 114 and 115. The yoke 117 may be moved in either direction to be engaged with either of the gears 114 or 115 by means of the lever arm 118. Through the gearing described, the cradle can be driven in either direction. The transverse shaft 116 carries at its farther end a worm 120 which meshes with and drives a worm wheel 121 secured to the shaft 122. The shaft 122 is suitably journaled in the frame 15 and carries adjacent one end a worm 123 which meshes with a worm wheel 124 keyed to the upright shaft 125 (Figures 2 and 6).

The upright shaft 125 carries a worm 126 which meshes with a worm wheel 127 which is secured to the cradle 14. By the means described, 21 slow rotary motion at a uniform velocity is imparted to the cradle to move the cradle on its axis. -The machine illustrated is so constructed that the axis of the cradle intersects the axis of the blank in its apex, when the tool-and blank are in proper cutting position. Hence, in the machine illustrated, the tool and blank are rolled relatively to each other in a manner corresponding to the rolling motion of a gear and a basic crown gear.

The tool reciprocation and the blank rotation must be so timed relatively to each other that the tool on each succeeding stroke cuts in another tooth space of the blank. Now the main drive shaft 22 is journaled coaxially of the cradle 14. It derives its motion directly from the motor and is not affected by the movement of the cradle. Because of the slow rotational movement of thecradle, the timed relation between the tool and blank will be disturbed. Some means must be employed, therefore, to compensate for the cradle movement. This might be done by using especially calculated ratios for the change gears. but this would require new calculations wherever the rate of roll is changed and it would also be necessary to carefully reset the tool when starting a new out. A differential 1s,

therefore, preferably, employed for the purpose. The difierential will always maintain the, proper relation between the tool and blank movements.

In the machine illustrated, the differential is incorporated in the blank drive. This differential comprises the differential gears 81 alreadymentioned and the housing 130 for these gears.

The compensating motion is effected by retation of the housing 130. The housing 130 is rotated from the shaft 122 by means of the bevel gears 131 and 132, the transverse shaft 133, the bevel gears 134 and 135 (Figure 2) the shaft 136, the ratio change gears 137, 138, 139 and 140 (Figures 1 and 2), the shaft 141, (Figures 1 and 7) the spur pinion 142, and the spur gear 148. The latter gear 143 is secured to the housing 130 of the differential. By the gearing just described, an additional motion is imparted to the shaft 82 and thence to the .blank spindle to compensate for the movement of the cradle, thus maintaining the correct timed relation between the tool and blank movements.

The machine illustrated is constructed to produce longitudinally curved tooth gears. In a pair of such gears, the teeth of the two members are of opposite hand. It is generally preferable to have the tool crank rotate in one direction. Hence in cutting one member of the pair the blank must rotate in one direction and in cutting the other member the blank will rotate in the opposite direction. N ow the rotation of the blank in opposite directions changes the relation between the blank and main drive shaft for which the ratio change gears and the differential compensate. Thus in machines of the type illustrated operating upon the continuous cutting process, different ratio change gears are required in cutting the two members of a. pair of gears. )Vith the machine of the present invention, the same ratio change gears can be employed in cutting both members of a pair. This improvement is achieved by incorporating an additional differential in the blank train and driving all the elements of the blank and cradle drives including the compensating differential through this additional differential.

The elements of the additional differential have been already described. They comprise the differential gears 69. and 71 (Figure 2) and the differential housing 66. The required power drive is obtained from the main drive shaft 22 through the gears 77, and 76, the shaft 7 5 and the differential gear 71. The motion which compensates for the directional movement of the cradle is obtainedfrom the bevel gear 74 which is secured to the cradle and which moves with the cradle. As the cradle moves in either direction. this gear 74 speeds up or retards the auxiliary shaft 68, thus compensating for the cradle movethe primary object of this invention is to provide a machine in which an additional relative movement at a variable velocity imparted between tool and blank, to combine with the reciprocatory movement of the tool and the uniform rotational movement of the blank to produce the desired longitudinal tooth shape. The means for im arting this additional variable motion will e described neat.

hecured to the auxiliary shaft 68, as has already been described, is a bevel gear 105 (Figure 1) which meshes with-and drives a bevel gear 106 and through this bevel gear the shaft167. The shaft 107 has fastened to it a crank plate 145 (Figures 1 and 3) the crank plate 145 carries a pin 146 which moves 116 is a rack 151. This rack 151 meshes with a segmental gear 159; which is secured to the housing 153 of the differential gears 86 ab ready referred to.

The crank 145, of course, imparts a variable motion of a harmonic nature to the rack'151 and through this rack 151 a corresponding variable motion is imparted to the differential housing 158. Through'this housing and the difit'erential gears 83 this additional variable motion is incorporated in and combined with the uniform velocity indexing motion of the blank. In this way, the blank receives a motion which is a resultant of the uniform velocity indexing and the added variable velocit motion just described. Through the di erential gears 83 the additional variable velocity motion is so transmitted to the blank that the blank receives a continuous motion at a variable velocity in one direction.

Preferably the gearing of the machine is so proportioned that the crank 145 rotates exactly twice as fast as the tool crank 17 as it has been found that this arrangement gives the most desirable form of longitudinal tooth curve.

While the additional variable velocity mo cntial in the tool or cradle drives also. The

and the added variable velocit motion imparted to the blank through t e crank 145 control the-tooth shape to be produced upon the blank, while the motion of the cradle in the machine illustrated causes the generation of the tooth profiles conjugate to the basic gear with which the blank is theoreti cally rolled during the cutting process.

An added feature of the machine illustrated is the mechanism for controlling the clappin movements of the tool so as to cause the too to be swun any desired distance away from the blank during the idle or return stroke. The clappin of the tool is controlled, as in the machine illustrated incur copending application already referred to, from a cam 155 which is formed integral with the tool crank plate 17 (Figure 2).

Mounted in a suitable bracket 154 secured to the cradle 14 is a reciprocable rod 156 which carries at one end a roller 157 which rides in the cam groove 155. The cam groove 155 is so formed that it causes two movements of the rod 156m one complete rotation of the crank plate 17. One movement causes, through the mechanism now to be described, a withdrawal of the tool from cuttin position and the other movement returns t e tool into cutting position.

Secured to the rod 156 (Figures 1, 1 and 5) is a rack 158. The'rack 158 meshes with and drives a pinion 159 formed. integral with the sleeve 160 which is journaled in the bracket 151. Fastened to the sleeve 160 is a spur gear 161 which meshes with a spur gear 162 which is secured to a parallel sleeve 166. The sleeve 163 is connected through the rod 16d and the universal joint 165 with a telescoping shaft 166 (Figure 1).

The telescoping shaft 166 has a universal joint connection 167 at its opposite end with a shaft 168 (Figures 1 and 9) which carries a bevel gear 169 which meshes with a bevel gear 170 which is secured to a shaft 171 that is journaled in the tool head 16. 1

The shaft 171 carries at its upper end a segmental gear 172 (Figures 8 and 91 which meshes with a rack 173. The segmental gear 1712 is connected by means of a pin 171 with a block 17 5 which slides in a slot 176 formed in the pivotal clapper block 177.

The tool T is mounted in a suitable holder which is secured in the clapper block 177. The clapper block 177 is mounted for pivotal movement upon a pin 178 which is j ournaled in the tool head 10..

Oscillation of the segmental gear 172 through reciprocation of the rod 156 and the rack 158 causes a swinging movement of the clapper block 177 about its pivot pin 178. Thus, the tool T is swung to and from cutting position, being in cutting position upon the cutting stroke of the tool and out of cutting I'll position on the return stroke, during which the-continuous motion of the blank causes the blank to be indexed. l

The rack 173, already referred to, slides 1n agroove formed in the tool head'lO. This rack 173 carries a toggle member 180 which is adapted at one limit of therack movement to cooperate with a notch in the clapper block 17 7 to lock this clapper block securely against a the seat 181 formed onthe tool head 10, thereby holding the tool firmly against vibration during the cutting stroke.

Figure 8 shows the rack 173 and toggle in looking position with the tool in cutting position. When the rod 156, rack-158 and segmental gear 172 are moved from the positions shown under actuation of the cam 155, the clapper block 177 will be rocked about its pivot 178 to withdraw the tool from cutting position and simultaneously the rack 173 will be moved to Withdraw the toggle 180 from clamping position.

The provision of the change gears 161 and 162 in the drive to the clapper block permits of complete and very flexible control over the amount of clapping movement of the tool, whereby, by simply changing these change gears, the segmental gear can be oscillated a greater or less amount on its axis and the, tool swung a greater or less distance away from the blank during the idle stroke. With this arrangement, it is possible to move the tool away from the blank a shorter distance for small sized gears and for gears which are cut to comparatively small depth than when large gears and gears of considerable tooth depth are being out. In this way, the machine can be run faster and a saving of time is effected in the cutting of small gears. Instead of the arrangement described, however, it will be understood that the same effect may be obtained by employing for the cutting of various size gears, different size racks 158 and pinions 159 and connecting the sleeve 160 directly with the telescoping shaft 166, through the rod 164 and one member of the universal connection 165.

The tool T as already described is mounted upon the clapper block 177 which is in turn pivotally secured to the tool head 10. The tool head 10 is angularly adjustable upon the tool head carrier 185, so that the tool may be adjusted to obtain the proper tool clearance. The head 10 may be secured upon the carrier 185 by means of the bolts 186 which engage in arcuate slots 187 on the tool head. These slots 187 are preferably curved about the tool cutting edge as a center, whereby the angular adjustment of the tool may be obtained without altering the pressure angle of the gear to be cut.

The tool head carrier 185 is itself laterally adjustable upon the tool slide 11 so that the tool can be adjusted toward and from the center of the machine, that is the center of the cradle, for cutting gears of different cone distances. This adjustment may be effected by rotation of the shaft 189 which carries a pinion 190 which meshes with a rack 191 secured to the tool slide 11.

The tool slide 11, as already described,

reciprocates in guide ways 12 formed in an arm 13 which is pivotally adjustable upon the cradle 14. Preferably, the pivotal axis of this arm 13 is offset from the axis of the cradle 14, for the purpose, described in our copending application alreadv referred to. of oil"- setting the path of tool movement relative to the axis of the cradle. By rotation of the worm shaft 192 which is journaled in the arm 13 and which carries a worm 193 which meshes with a worm wheel 194 secured to a shaft 195 which carries at its opposite end a spur gear 196 meshing with a segment 197 (Figures 9 and 2) secured to the cradle 14, the arm 13 can be adjusted on the cradle 1 1 and the tool path offset any desired distance from the cradle axis or blank apex. This angular adjustment of the arm 13 permits of a complete control over the spiral angle of the gears to be produced, so that upon the machine illustrated, gears of any desired spiral angle can be cut.

The machine shown is a single tool machine, but, it will be understood, that by a suitable arrangement two tools might also be employed.

While we have described our invention particularly with reference to a machine for generating bevel gears, it is to be understood that this invention is applicable also to the production of other types of gears, as spur, helical, herringbone, and hypoid, whether generated or non-generated. In the cutting of spur, helical and herringbone gears, the tool will be reciprocated in a plane parallel to the blank axis according to the principles set forth in our copending application No. 145,903, November 2, 1926. In the cutting of hypoid gears, the blank axis will preferably be offset from the axis of the cradle.

In general it may be said, that, while we have described our invention in connection with a specific structure and in connection with specific uses for said structure, it is to be understood that the invention is capable of various further modifications and uses and that the structure may be modified within the limits of the invention without departing from its intent or the scope of the following claims and that this application is intended to cover any adaptations, uses, or embodiments, following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice in the gear art and may be applied to the essential features hereinbefore set forth and as fall within the scope of the invention or the limits of the appended claims.

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Having thus described our invention, what We claim is:

l. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, means for moving the tool at a variable velocity across the face of the blank, means for imparting a continuous rotary movement at a uniform velocity to the blank s indle for the purpose'of continuously indexing the blank, and means for simultaneously imparting an additional rotary movement tothe blank spindle about its axis atavariable velocity, said last named movement combining with the indexing rotation of the blank and the movement of the tool to produce the longitudinal tooth shape of the blank.

2. lln a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, means for moving the tool at a variable velocity across the face of the blank, means for imparting a continuous rotary movement at a uniform velocity to the blank spindle for the purpose of continuously indexing the blank and means for simultaneously imparting an additional rotary movement to the blank spindle about its axis at a variable velocity, said last named movement combining with the indexing rotation of the blank and the movement of the tool to produce the longitudinal tooth shape of the blank, and means for simultaneously producing a relative rolling movement between the tool and blank to generate the tooth profiles.

3. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, means for moving the tool at a variable velocity of a harmonic nature across the face of the blank, means for imparting a contiuuous rotation at a uniform velocity to the blank spindle for the purpose of continuously indexing the blank, and means for simultaneously imparting to the blank spindle about its axis an additional movement at a variable velocity of a harmonicnature but of a different frequency than the harmonic movement of the tool, said last named movemcnt combining with the indcxingrotaiion of the blank and the movement of the tool to produce the longitudinal tooth shape of the blank.

l. lln a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blankspindle journaled therein, means for moving the tool at a variable veloc ity of a harmonic nature across the face of the blank, means for imparting a continuous rotary movement at a uniform velocity to the blank spindle for the purpose of continuously indexing the blank, means for sin'lultaneously imparting to the blank spindle about its axis an additional rotational movement at a variable velocity of a harmonic nature but of a different frequency from the first harmonic movement, said last named movement combining with the indexing rotation of the blank and the movement of the tool to produce the longitudinal tooth shape of the blank, and means for simultaneously producing a relative rolling movement between the tool and blank to generate the tooth profiles.

5. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle j ournaled therein, means for moving the tool at a variable velocity of a harmonic nature across the face of the blank, means for imparting a continuous rotary movement ata uniform velocity to the blank spindle for the purpose of continuously indexingthe blank, and means for simultaneously 1mparting to the blank spindle on its axis an additional rotational movement at a variable velocity of a harmonic nature butof twice the frequency of the first harmonic movement, said last named movement combining with the indexing rotation of the blank and the movement of the tool to produce the longitudinal tooth shape on the blank.

6. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, means for moving the tool at a variable velocity of a harmonic nature across the face of the blank, means for imparting a continuous rotary movement at a uniform velocity to the blank spindle for continuously indexing the blank, means for simultaneously imparting to the blank spindle on its axis an additional rotational movement at a variable velocity of a harmonic nature but of twice the frequency of the first harmonic movement, said last named movement combining with the indexing rotation of the blank and the movement of the tool to produce the longitudinal tooth shape of the blank and means for simultaneously producing a relative rolling movement between the tool and blank to generate the tooth profiles.

7. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle j ournaled therein, means for moving the tool at a variable velocity across the face of the blank, means for imparting a continuous rotary movement at a uniform velocity to the blank spindle to con tinuously index the blank, means for simul taneously imparting to the blank spindle an additional rotational movement at a variable velocity, said last named movement combining with the indexing rotation of the blank and the movement of the tool to produce the longitudinal tooth shape of the blank, and means for simultaneously producing a continuous relative movement between the tool and blank about an axis intersecting the axis-of theblank.

8. In a machine for producing gears, a tool support, a tool mounted thereon, a blank suptudinal tooth shape of the'blank, and means for simultaneously producing a continuous relative movement between the tool and blank about an axis intersecting the axis of the blank. 9. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, means including a train of gearing for moving the tool at a variable velocity across the face of the blank, means including a train of gearing for impartinga continuous rotary.

- movement at a uniform velocity to the blankv spindle, a differential incorporated in one of said trains, and means for continuously imparting a movement at-a variable veloclty to one element of said differential, said lastnamed variable movement combining with the other movements of tool and blank to produce the longitudinal tooth shape. 10. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, means including a train of gearing for moving the tool at a variable velocity of a harmonic nature across the face of the blank,

means including a train of gearingfor im- .parting a continuous rotary movement at a uniform velocity to the blank spindle, a differential incorporated in one of said trains, and means for continuously imparting to one element of said differential a movement at a variable velocity of a harmonic nature but of a different frequency from the first, said lastnamed variable movement combining with the other movements of tool and blank to produce the longitudinal tooth shape.

' 11. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a

crank for actuating the tool and a train of 1 gearing for driving the crank, means includmg a train of gearing for imparting a continuous rotary movement at a uniform velocity to the blank spindle, a differential incorporated in one of said trains of gearing,

means including a crank which is driven continuously at a velocity different from the tool crank, for driving one element of said differential, thereby to produce an added movement between tool and blank at a variable velocity of a harmonic nature but of a different frequency from the harmonic movement of the tool, said movement combining with the other movements of tool and blank to produce the longitudinal tooth shape.

12. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a carrier upon which one of said supports is mounted, means including a train of gearing for moving the tool at a variable velocity across the face of the blank, means including a train of gearing for imparting a continuous rotary movement at auniform velocity to the blank spindle, means including a train of gearing for imparting a continuous movement to said carrier to generate the tooth profiles a differential incorporated in one of said trains, and means for continuously impart- .ing a movement at a variable velocity to one element of said differential, said last-named variable movement combining with the other movements of tool and blank to produce the longitudinal tooth shape.

13. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a carricr upon which one of said supports is mounted, means including a train of gearing for moving the tool at a variable velocity of a harmonic nature across the face of the blank, means including a train of gearing for imparting a continuous rotary movement at a uniform velocityto the blank spindle, means including a train of gearing for imparting a continuous movement to said carrier to generate the tooth profiles, a differential incorporated in one of said trains, and means for continuously imparting to one element of said differential a movement at a variable velocity of a harmonic nature but of a different fre quency from the first harmonic movement, said last named movement combining with the other movements of tool and blank to produce the longitudinal tooth shape.

14. In a machine for producing gears, a tool support, a tool mounted thereon a blank support, a blank spindle journaled therein, a carrier upon which one of said supports is mounted, a crank for actuating the tool to reciprocate the tool at a variable velocity across the face of the blank, a train of gearing for rotating said crank, means including a train of gearing for imparting a continuous rotary movement at a uniform velocity to the blank spindle, means including a train of gearing for imparting a continuous movement to said carrier to generate the tooth profiles, a differential incorporated in one of said trains, means including a crank,which is driven continuously at a different velocity from that of the tool crank, for driving one element of said differential, thereby to produce an added movement at a variable velocity between tool and blank, said movement combining with the other movements of tool and blank to produce the longitudinal tooth shape. 7

15. In a-machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank s indle journaled therein, a cradle upon which one of said supports is mounted, means including a train of gearing for moving the tool at a variable velocity across the face of the blank, meansincluding a train of gearing for imparting a continuous rotary movement at a uniform velocity to the blank spindle, means including a train of gearing for imparting a continuous rotary movement to said cradle on its axis to generate the tooth profiles, a differential incorporated in one of said trains, and means for continuously imparting a variable velocity movement to one element of said differential, said movement combining with the other movements of tool and blank to produce the longitudinal tooth shape.

16. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank s indle journaled therein, a cradle upon whic one of said supports is mounted, means including a train 0 gearing for moving the tool across the face of the blank at a variable velocity of a harmonic nature, means including a train of gearing for imparting a continuous rotary movement at a uniform velocityto the blank spindle, means including a train of gearing for imparting a continuous rotary movement to the cradle on its axis to generate the tooth profiles, a differential incorporated in one of said trains, and means for continuously imparting to one element of said differential a movement at a variable velocity 'of a hartit) monic nature but of a different frequency fronnthe first harmonic movement, said lastnamed variable movement combining with the other movements of tool and blank to produce the longitudinal tooth shape.

17. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a cradle upon which one of said supports is mounted, a crank for reciprocatin the tool, a train of. gearing for driving t e crank, means including a train ofgearing for imparting a continuous rotary movement at a uniform velocity tot-he blank spindle, means including a train of gearing for imparting a continuous rotary movement to the cradle on its axis to generate the tooth profiles, a differential incorporated in one of said trains, and means including a crank which is driven continuously at a velocity different from the tool crank, for driving one element of said differential thereby to produce an added movement at a variable velocity between tool and blank, said movement combining with the other movements of tool andiblank to pro duce the longitudinal tooth shape.

18. In a machine for producing gears, a:

tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a-

carrier upon which one of said supports is mounted, means mcludmg a tram of gearing for moving-the tool ata variable velocity across the face of the blank, means including a train of gearing for imparting a continuous rotary movement at a uniform velocity to the blank spindle, means including a train of gearing for imparting ,a continuous move- 'ment to said carrier to generate the tooth profiles, compensating mechanism for maintainmg a timed relation between the tool and blank movements during the movement of said carrier, a difierential incorporated in one of said gear trains, and means for consupport, a blank spindle journaled therein, a

carrier upon which one of said su ports is mounted, means including a train of gearing for movin the tool at a variable velocity of a harmonic nature across the face of the blank, means including a train of gearing for imparting a continuous rotary movement at a uniform velocity to the blank spindle, means including a train of gearing for imparting a continuous movement to said carrier to generate the tooth profiles, compensating mechanism for maintaining a timed relation between the tool and blank movements during the movement of said carrier, a differential incorporated in one of said gear trains, and means for continuously imparting to one element of said differential a movement at a variable velocity of a harmonic nature but mounted, a crank for reciprocating the tool,

a train of gearing for actuating the crank, means including a tram of gearing for 1mparting a continuous rotary movement at a uniform velocity to the blank spindle, means including a train of gearing for imparting a continuous movement to said carrier to generate the tooth profiles, compensating mechanism for maintaining a timed relation between the tool and blank movements during the movement of said carrier,a differential incorporated in one of said trains, a crank for driving one element of said differential,

, tudinal tooth shape.

21. In a machine forproducing gears,'a tool support, a tool mounted thereon a blank support, a blank spindle journaled therein, means for moving the tool at a variable velocity across the face of the blank, a differential, a train of gearing connecting said differentiak with the blank spindle,'means for driving one element of the differential continuously at a uniform velocity to impart to the blank spindle a continuous indexing movement and means for driving another element of-said difierential continuously at a variable velocity, whereby the blank spindle receives a motion which is a resultant of said uniform and variable velocity movements and which combines with the variable movement of the tool to produce the longitudinal tooth shape.

22. In a machine for producing gears, a

tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, means for removing the tool. at a Variable velocity of a harmonic nature across the face of the blank, a differential, a train of gearing connecting said differential with the blank spindle, means for driving one element of said difierential continuousl at a uniform velocity to impart to the blan spindle a continuous indexing move ment, and means for driving another element of said differential continuously at a variable velocity of a'harmonic nature but .of a difierent frequency from the first harmonic motion, whereby the blank spindle receives a motion which is a resultant of said uniform and variable movements and which combines with the variable movement of the tool to produce the longitudinal tooth shape.

23. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a crank for reciprocating the tool, means for continuously rotating the crank, a differential. a train of gearing connecting said differential with the blank spindle, means for driving one element of said differential continuously at a uniform velocity to impart to the blank spindle a continuous indexing movement, and a crank, which is driven cont nuously at a velocity different from the tool crank, for driving another element of said differential, whereby the blank spindle receives a motion which is a resultant of uniform and variable movements and which combines with the reciprocatory movement ofthe tool to produce the longitudinal tooth shape.

24. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a carrier upon which one of said supports is mounted, means for moving the tool at a variable velocity across the face of the blank, a differential, a train of gearing connecting said differential with the blank spindle, means for driving one element of said differential continuously at a uniform velocity to impart to the blank spindle a continuous indexing movement, means for driving another element of said differential continuously at a variable velocity,,whereb'y the blank spindle receives a motion which is a resultant of said uniform and variable movements and which combines with the variable movement of the tool to produce the longitudinal tooth shape, and means for imparting to said carrier a continuous movement to generate the tooth profiles.

25. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spmdle journaled therein, a carrier upon which one of said supports is mounted, means for moving the tool at a variable velocity of a harmonic nature across the face of the blank, a differential, a train of gearing connecting said differential with the blank spindle, means for driving one element of the differential continuously at a uniform velocity to impart to the blank spindle a continuous indexing movement, means for driving another element of said differential continnously at a variable velocity of a harmonic nature but of a different frequency from the first harmonic movement, the blank spindle thereby receiving a motion which is a resultant of the described uniform and variable velocity movements, and means for imparting to said carrier a continuous movement to generate the tooth profiles.

26. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journalcd therein, a carrier upon which one of said supports is mounted, means including a crank for reciprocating the tool at a variable velocity across the face of the blank, a dificrential, a train of gearing connecting said difierential with the ,blank spindle, means for driving one element of said differential continuously at a uniform velocity to impart to the blank spindle a continuous indexing movement, means including a crank, which is driven continuously at a velocity different from that of the tool crank for driving another element of said differential, whereby the blank spindle receives a motion which is a resultant of uniform and variable movetool at a variable velocity across the face of the blank, a differential, a train of gearin connecting said differential with the blan spindle, means for driving one element of said differential continuously at a uniform velocity to impart to the blank spindle a continuous indexing. movement, means for driving another element of said difi'erential continuously at a variable velocity whereby the blank spindle receives a motion which is a'resultantof said uniform and variable movements and which combines with the variable movement of the tool to produce the longitudinal tooth shape, means for imparting to said carrier a continuous movement to generate the tooth profiles, and compensatin means for maintaining a timed relation between the tool and blank movements durin the movement of said carrier.

28. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a carrier upon which one of said supports is mounted, means for moving the tool, at a variable velocity of a harmonic nature across the face of the blank, a differential, a train of gearing connecting said differential with the blank spindle, means for driving one element of said differential continuously at a uniform velocity to impart to the blank spindle a continuous indexing movement,

means for driving another element of said differential continuously at a variable velocity of a harmonic nature but of a different frequency from the first harmonic movement, whereby the blank spindle receives a motion which is a combination of uniform and variable movements and which combines with the variable movement of tool to produce the longitudinal tooth shape, means for imparting to said carrier a continuous movement togenerate the tooth profiles, and compensating means for maintaining a timed relation between the tool and blank movements during the movement of said carrier.

29. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a cradle, upon which one of said supports is mounted, movable about an axis intersecting the axis of the blank spindle, means for moving the tool at a variable velocity across the face of the blank, a differential, a train of gearing connecting said differential with the blank spindle, means for drivin one element of the differential continuous y at a uniform velocity to impart to the blank spindle a continuous indexing movement, means for driving another element of said differential continuously at a variable velocity, whereby the blank spindle receives a motion which is a combination of uniform and variable movements and which combines with the variable movement of the tool to produce the longitudinal tooth shape, means for impartthe movement of the cradle.

30. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a cradle, upon which one of said supports is mounted, movable about an axis intersecting the axis of the blank spindle, means for moving the tool across the face of the blank at a variable velocity of a harmonic nature, a differential, a train of gearing connecting said differential with the blank spindle, means for driving one element of the differential continuously at a uniform velocity to impart to the blank spindle a continuous indexing movement, means for driving an other element of said differential continuously at a variable velocity of a harmonic nature but of a different frequency from the first harmonic movement, whereby the blank spindle receives a motion which is a combination of uniform and variable movements and which combines with the variable movement of the tool to produce the longitudinal tooth shape, means for im arting a continuous movement to said cra le to generate the tooth profiles, and compensating mechanism for maintaining a timed relation between the tool and blank movement during the movements of-said cradle.

31. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a cradle, upon which one of said supports is mounted, movable about an axis intersecting the axis of the blank spindle, means including a crank for reciprocating the tool, a difl'erential, a train of caring connecting said differ ential with the lank spindle, means for driving one element of the differential continuously at a uniform velocity to impart to the blank spindle a continuous indexing movement, means including a crank, which is driven continuously at a velocity different from the tool crank, for driving another element of said diiferential, whereby the blank spindle receives a motion which is a combination of uniform and variable-movements and which combines with the variable movement of the tool to produce the longitudinal tooth shape, means for imparting to said cradle a continuous movement at a uniform velocity to generate the tooth profiles, and compensating mechanism for maintaining a timed relation between the tool and blank movements during the movement of said cradle.

,32. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a carrier upon which one of said supportsis mounted, means for imparting a cutting movement to the tool, a main drive shaft, an

auxiliary shaft, means for rotating said auxiliary shaft comprisin a differential, one element-of which is driven from said main drive shaft and another element of which is operated by movement of said carrier, means for imparting a continuous movement to said carrier to move the tool and blankrelatively to each other, gearing driven froni'said auxiliary shaft for rotating the blank. spindle continuously on its axis, and compensating mechanism in said blank spindle drive; for maintaining a timed relation between the tool and blank movements during movement of said carrier.

33. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a cradle upon which one of said supports is mounted, means for imparting a cutting movement to the tool, a main drive shaft, an auxiliar shaft, means for rotating said auxiliary s aft comprising a differential, one element of which is driven from said main drive shaft and another element of which is operated by movement of the cradle on its axis, means for movingthe cradle continuously on its axis to'generate the tooth profiles, gearing driven from said auxiliary shaft for continuously rotating the blank spindle, and compensating means in said blank spindle drive for maintaining a timed relation between the tool and blank movements during the movement of the cradle.

34. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank-spindle journaled there in, a cradle, upon which one of said supports is mounted, movable about an axis intersecting the apex of the blank, a main drive shaft, means actuated from said'main drive shaft for actuating the tool, an auxiliary shaft, means for rotating said auxiliarty shaft comprising a differential one element 0 which is driven from the main drive shaft and the other element of which is operated by movement of the cradle, means driven from said auxiliary shaft for moving the cradle con tinuously on its axis, gearing driven from said auxiliary shaft for continuously rotat- 'ing the blank spindle and compensating mechanism in said blank spindle drive for maintaining a timed relation between the tool and blank movements during the movement.

of the cradle. I

35. In "a machine for producinggears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a carrier upon which one of said supports is mounted, a main drive shaft, means including a train of gearing operated from said main drive shaft for moving the tool at a variable velocity across the face of the blank, an auxiliary shaft, means for rotatlng said auxiliary shaft comprising a diiferential, one element of which is driven from said main drive shaft and another element of which'is operated by movement of said carrier, means including a train of gearing operated from said auxiliary shaft for imparting a continuous movement to the carrier to generate the tooth profiles, gearing operatively connec-tin the auxiliary shaft and blank spindle and a apted to impart to the blank spindle a continuous rotary motion atv a uniform velocity, compensating mechanism in said blank spindle drive for maintainin a timed'relation between the tool and blank uring the movement of the carrier, a second differential in one of said trains, and means for continuously imparting to one element of said second differential a motion at a variable velocity, said motion combining of a harmonic nature, an auxiliary shaft,

means for rotating said auxiliarly shaft comprising a differential, one element of which is driven" from said main drive shaft and another element of which is operated by movement of said carrier, means including a train of gearing operated from said auxiliary shaft for imparting a continuous movement to the carrier at a uniform velocity to generate the tooth profiles, gearing operatively connecting the auxiliary shaft and blank spindle, and adapted to impart to the' blank spindle a continuous rotary motion at a uniform velocity, compensating mechanism in said blank spindle drive for maintaining a timed relation between the tool and blank during movement of said carrier, a second differential in one of said trains, and means for continuously imparting to one element of said second differential a motion at a variable velocity of a harmonic nature but of a different frequency from the first harmonic motion, said last named motion combining with the variable movement of the tool and the uniform movement of the blank spindle to produce the a longitudinal tooth shape.

37. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a carrier upon which one of said supports is mounted, a maindrive shaft, means including a train of gearing operated from said shaft for moving the tool at a variable velocity across the face of the blank, an. auxiliary shaft, means for rotating said auxiliary shaft comprising a diflerential, one element of which is driven from said main drive shaft and another element of which is operated by movement of said carrier, means including a train of gearing operated from said'auxiliary shaft for imparting a continuous movement to the carrier to generate the tooth profiles, gearing operatively connecting the auxiliary shaft and blank spindle, and adaptedsupport, a blank spindle journaled therein, a

carrier uponwhich one of said supports is mounted, a main drive shaft, means including a train of gearing operated from said shaft for moving the tool across the face ofthe blank at a variable velocity of a-harmonio nature, an auxliary shaft, means for rotating said auxiliary shaft comprising a differential, one element of Which is driven from said main drive shaft and'anotherelement of which is operated by movement of said carrier, means including a train of gearing operated from said auxiliary shaft for imparting continuous movement to the carrier to generate thetooth profiles, gearing operatively connecting the auxiliary shaft and blank spindle and adapted to impart to the blank spindle a continuous rotary motion at a uniform velocity, compensating mechanism in said blankspindle drive for maintaining a timed relation between the tool and blank during the movement of the carrier, and means for simultaneously producing between tool and blank an added movement at a variable velocity of a harmonic nature but of a different frequency from the first harmonic movement, said movement combining with the variable movement of the tool and the uniform movement of the blank spindle to produce the longitudinal tooth shape.

39. In a machine for producing gears, a tool support a tool mounted thereon, a blank support, avblank spindle journaled therein, a cradle upon which one of said supportsis mounted, a main drive shaft, means actuated lit] from said shaft for moving the tool at a variable velocity across the face of the blank, an auxiliary shaft, means for rotating said auxiliary shaft comprising a differential, one element of which is driven from said main drive shaft and another element of which is operated by movement of said cradle, means driven from said auxiliary shaft for impartfrom said main drive shaft for movin between the tool and blank durin ing a continuous rotary movement to said cradle to generate the tooth profiles, gearing operatively connectin the auxiliary shaft and blank spindle an adapted to impart to the blank spindle a continuous rotary movement at a uniform velocity, com ensating mechanism in said blank spin le drive adapted to maintain a timed relation between the tool and blank during the movement of the cradle, and means for imparting to said blank spindle simultaneously with its uniform motion a variable motion, said last named means being actuated from said aux-- iliary shaft.

40. In a machine for producing gears, a

.tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein,

a cradle upon which one of said supports is mounted, a main drive shaft, means actuatgd t e tool across the faceofthe blank at a variable velocity of a harmonic nature, ail-auxiliary shaft, means for rotating said auxiliary shaft 1 comprising a differential, one element of which is driven from said main drive shaft and another element of which is operated by movement of saidcradle, means driven from said auxiliary shaft for moving said cradle on its axis to generate the tooth profiles, gearing operatively connectin the auxiliary shaft and blank spindle and a apted to impart to the blank spindle a continuous rotary movement at a uniform velocity, compensating I mechanism in said blank spindle drive adapted to maintain a timed relation between the tool and blank during the movement of the cradle and means for imparting to saidblank spindle simultaneously with its uniform motion, an added rotational movement at a variable velocity of a harmonic nature but of a different frequency from the first harmonic motion, said last named means being actuated from said auxiliary shaft.

41. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a cradle upon which one of said supports is mounted, a main drive shaft, means actuated from said shaft for moving the tool at a variable velocity across the face of the blank, an auxiliary shaft, means for rotating said auxiliary shaft comprising a differential, one

ment of the cradle, a second di erential in said blank spindle train, and means actuated from said auxiliary shaft for imparting to the moveone element of said second differential a movement ata variable velocity.

42. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a cradle upon which one of said supports is mounted, a main drive shaft, means actuated from said shaft for moving the tool across the face of the blank at a variable velocity of a harmonic nature, an auxiliary shaft,

means for rotatin said auxiliary shaft comprising a diiferentlal, one element of which is driven from said main drive shaft and another element of which is operated by movement of said cradle, means driven from said auxiliary shaft for moving the cradle on its axis to generate the tooth profiles, gearing operatively connecting the auxiliary shaft and blank spindle, compensating mechg0 anism in said blank spindle drive for maintaining a timed relation between the tool and blank during the movement of the cradle, a differential in said blank spindle train, and means actuated from said auxiliary shaft for imparting to one element of said differential a movement at a variable velocity of a harmonic nature but of a different frequency from the first harmonic movement.

43. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a cradle upon which one of said supports is mounted, movable about an axis intersecting the axis of the blank spindle, a main drive shaft, a crank actuated from said shaft for moving the tool at a variable velocity across the face of the blank, an auxiliary shaft, means for rotating said auxiliary shaft comprising a differential, one element of which is driven from said main drive shaft and another element of which is operated by movement of said cradle, means driven from said auxiliary shaft for moving said cradle on its axis at a uniform velocity 5 to generate the tooth profiles, gearing operatively connecting the'auxiliary shaft and blank spindle compensating mechanism in said blank spindle drive for maintaining a timed relation between the tool and blank during the movement of the cradle, a differential in said blank spindle train, and means actuated from said auxiliary shaft for imparting to one element of said last named differential a movement at a variable velocity of a harmonic nature but of a different frequency from the variable movement of the tool under actuation of its crank.

44. In a machine for producing tapered gears, a tool, means for imparting a cutting on movement to the tool, a frame, a lank spin- :dle provided at one end with means for securing'a gear blank thereto and at the other end wit-h means for securing a pinion blank thereto,*a support, in which said blank spin- 65 dle is journaled, swivelly mounted on the gears, a tool support, a tool mounted thereon,

means for imparting a reciprocatory movement to the tool, a blank spindle provided at one end with means for securing a tapered gear blank thereto and at the other end with means for securing a tapered pinion blank thereto, a support, in which said spindle is journaled, swivelly mounted on the frame, means for swivelling said support about its axis to adjust the blank spindle end for end, a drive gear journaled in said support coaxially of its swivelling axis, means for driving said gear continuously, a worm wheel secured to said blank spindle and gearing journaled in said carrier operatively connecting said worm wheel with said drive gear.

46. In a machine for producing gears, the combination with a reciprocating tool slide,

a crank disc and a connecting rod for reciprocating the same, of a clapper block pivotally mounted on said slide, a tool secured to said clapper block, a cam member secured to said crank disc to rotate therewith, a member operatively connected with the cam and adapted to be moved periodically by rotation of the cam, and a-train of gearing operatively connecting said member with the clapper block, said train of gearing including a set of change gears for controlling the amount of pivotal movement of the clapper block.

47. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, means for moving the tool at a variable velocity across the face of the blank and means for simultaneously imparting to the blank a continuous rotary motion on its axis at a variable velocity, said last named motion combining with the tool motion to produce the longitudinal tooth shape.

48. In a machine for producing gears, a 1 tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein,

a crank for reciprocating the tool at a variable velocity across the face of the blank and means for simultaneouslv imparting to the blank spindle a continuous rotary motion on its axis at a variable velocity of a harmonic nature, said last named motion combining with the tool motion to produce the longitudinal tooth shape.

49. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a cradle upon which one of said supports is mounted, means for reciprocating the tool till lift

across the face of the blank, a main drive shaft, an auxiliary shaft, means for rotating said auxiliary shaft comprising a differential,

one element of which is driven from said main drive shaft and another element of which is operated by movement of the cradle on its axis, means for moving the cradle continuously on its axis to generate the tooth profiles, gearing driven from said auxiliary shaft for continuously rotating the blank spindle, and compensating means in said blank spindle drive for maintaining a timed relation between the tool and blank movements-during the movement of the cradle.

50. ][n a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a cradle upon which one of said supports is mounted, a crank for moving the tool across the face of the blank, a differential, a train of gearing connecting said differential with the blank spindle, means for driving one element of said differential continuously at a. uniform velocity to impart to the blank spindle a continuous indexing movement, means for driving the other element of said differential continuously "1 at a variablevelocity, whereby the blank spindle receives a motion which is a resultant of said uniform and variable velocity movements andwhich combines with the variable velocity movement of the tool to produce the longitudinal tooth shape, and means for imparting to said cradle a continuous movement on its axis to generate the tooth profiles. v

51. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a carrier upon which one of said supports ismounted, means for imparting a cutting movement to said tool, a main drive shaft, an auxiliary shaft, means for rotating said auxiliary shaft comprising a differential, one element of which is driven from said main drive shaft and another element of which is operated by the movement of said carrier, means for imparting a continuous movement to the carrier to move the tool and blank" relatively to each other, gearing driven from said auxiliary shaft for rotating the blank spindle continuously on its axis and compensating mechanism between the auxiliary shaft, carrier, and blank spindle for maintaining atimed relation between the tool and blank movements during the movement of said carrier.

52. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a carrier upon which one of said supports is mounted, means for imparting a cutting movement to the tool, a main drive shaft, an auxiliary shaft, means for rotating said auxiliary shaft comprising a differential, one element of which is driven from said main drive shaft and another element of which is operated by the movement of said carrier, means driven from said auxiliary shaft for imparting a continuous movement to the carrier, gearing driven from said auxiliary shaft for rotating the blank spindle continuously on its axis, and compensating mechanism between the auxiliary shaft, carrier, and blank spindle for maintaining a timed relation between the tool and blank movements during the movement of the carrier.

53. In a machine for producing gears, a tool support, a tool mounted thereon, a blank support, a blank spindle journaled therein, a carrier upon which one of said supports is mounted, means including a crank for reciprocating the tool, means including a train of gearing for imparting a continuous rotary movement at a uniform velocity to the blank spindle, means including a train of gearing for imparting a continuous motion to the carrier to generate thetooth profiles, a-differential incorporated in one of said trains,

and means for imparting a movement at a variable velocity to one element of said differential, said last named movement combining with the movements of the tool and blank to produce the longitudinal tooth sha e.

p ALLAN! H. CANDEE.

MAGNUS H. JOHANSON. I 

